Abstract
By combining different materials, for example, high-strength steel and unalloyed structural steel, hybrid components with specifically adapted properties to a certain application can be realized. The mechanical processing, required for production, influences the subsurface properties, which have a deep impact on the lifespan of solid components. However, the influence of machining-induced subsurface properties on the operating behavior of hybrid components with a material transition in axial direction has not been investigated. Therefore, friction-welded hybrid shafts were machined with different process parameters for hard-turning and subsequent deep rolling. After machining, subsurface properties such as residual stresses, microstructures, and hardness of the machined components were analyzed. Significant influencing parameters on surface and subsurface properties identified in analogy experiments are the cutting-edge microgeometry, S¯, and the feed, f, during turning. The deep-rolling overlap, u, hardly changes the residual stress depth profile, but it influences the surface roughness strongly. Experimental tests to determine fatigue life under combined rolling and rotating bending stress were carried out. Residual stresses of up to −1000 MPa, at a depth of 200 µm, increased the durability regarding rolling-contact fatigue by 22%, compared to the hard-turned samples. The material transition was not critical for failure.
Highlights
One of today’s challenges in mechanical engineering is the environmentally friendly and resource-saving production of components [1,2,3]
A shaft with material transition in axial direction serves as specimen geometry
The friction-welded shafts were impact extruded at a temperature of T = 900 ◦ C, in order to change the bonding zone geometry
Summary
One of today’s challenges in mechanical engineering is the environmentally friendly and resource-saving production of components [1,2,3]. In the fields of energy technology, medical technology, automotive engineering, and the aerospace industry, the requirements for high-performance solid components are increasing steadily [4,5,6]. For example, the aim is to reduce CO2 emissions by reducing vehicle weight [7,8]. The choice of material is, always based on the requirements of the intended application of the component. Requirements such as a reduction in weight with a simultaneous increase in mechanical strength cannot be realized with the use of one material.
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